The invention discloses a reinforcing thermal treatment technology for the pipe end of a petroleum steel pipe in a quenching and tempering condition. The technology comprises the following steps of: S1, performing the first-stage quenching and tempering treatment on the whole pipe; and S2, performing secondary tempering treatment on the middle part of the pipe body of the steel pipe obtained by the step S1. The secondary tempering treatment on the middle part of the pipe body of the steel pipe aims at reducing the strength of the middle part of the steel pipe and realizing the strength performance of a final product. The technology disclosed by the invention can realize strength mismatching between the pipe body and the pipe end of a petroleum steel pipe in a quenching and tempering condition, so that no obvious transition area exists between the pipe body and the pipe end of the steel pipe. According to the reinforcing thermal treatment technology for the pipe end of a petroleum steel pipe in a quenching and tempering condition, disclosed by the invention, the strength of the treated petroleum steel pipe is distributed in a mismatching manner, the weak point of easy deformation and even breakage caused by stress concentration of a threaded structure at the pipe end of an existing product can be eliminated, and the service safety of the steel pipe can be improved.